1918-19.] The Propagation of Earthquake Waves. 
171 
Table VI. — Primary Wave (P), Secondary Wave (S). 
r/ 2 = (r/v) 2 tabulated as a function of r. 
r. 
10- 
P. 
v. 
s. 
r. 
10" 
P. 
V- 
S. 
r. 
io- 
P. 
V. 
s. 
1 
78-85 
257*3 
0-805 
18-8 
59-8 
0-61 
9*23 
32 3 
0-995 
73-96 
239-2 
•8 
18-3 
58-3 
•605 
9-08 
31-8 
•990 
69-8 
. 228-5 
•795 
17-68 
56 7 
•6 
8-93 
31-3 
•985 
66-9 
217*0 
•79 
17T5 
552 
•595 
8-79 
30-8 
•98 
64-3 
205T 
•785 
16-67 
54-0 
•59 
8-64 
30-3 
•975 
61-8 
198-0 
•78 
162 
52-8 
•585 
8-5 
29-8 
•97 
59-3 
190-7 
•775 
15-73 
51-7 
•58 
8-35 
29-3 
•965 
56-5 
182-2 
•77 
1529 
50-8 
•575 
8-2 
28-8 
•96 
54*3 
173-7 
•765 
14-87 
50-3 
•57 
8*08 
28*3 
•955 
52-4 
167-2 
•76 
14-48 
49-7 
•565 
7-97 
27-8 
•95 
50-5 
160'5 
•755 
1413 
49T 
•56 
7-85 
273 
*945 
48*5 
154 6 
•75 
13-8 
48-5 
•555 
7-73 
26*8 
•94 
46 4 
149-1 
•745 
13-58 
47-9 
•55 
7-6 
263 
•935 
44-2 
143-7 
•74 
13-41 
473 
"545 
7-48 
25-9 
■93 
42 ’5 
138-4 
•735 
13-26 
46-8 
•54 
7 36 
25-4 
•925 
4P2 
133-5 
•73 
13T2 
46-2 
•535 
7-24 
25-0 
•92 
39-7 
128-7 
•725 
12-99 
45-6 
•53 
7-12 
24-5 
•915 
38*4 
124-6 
•72 
12-86 
45-0 
•525 
7-00 
24-0 
•91 
37T 
120-5 
•715 
12*72 
44-4 
•52 
6*88 
236 
•905 
358 
116-1 
•71 
12-57 
43-8 
•515 
6-76 
23T 
•900 
34-4 
111-8 
•705 
12-38 
432 
•51 
6-64 
22-7 
•895 
33’2 
107-5 
•7 
12-2 
42-6 
•505 
6-52 
22-2 
•89 
3P9 
103-3 
•695 
12*02 
42-0 
•5 
6-39 
2P8 
•885 
30-8 
98*7 
•69 
11-83 
41-4 
•495 
6-26 
21-3 
•88 
29-6 
94*2 
•685 
11-67 
40-8 
•49 
6T3 
20-9 
•875 
28-8 
91-8 
•68 
11-50 
40-2 
•485 
6-00 
20-5 
•87 
28-0 
89-2 
•675 
11-33 
39-7 
•48 
5-88 
20-2 
•865 
27-2 
86-6 
•67 
11T7 
390 
•475 
5-76 
19*8 
•86 
26-3 
84-1 
•665 
10-99 
38-4 
•47 
5-63 
19-4 
•855 
25-4 
81-5 
•66 
10-82 
37-9 
•465 
5-49 
19T 
•85 
24*6 
78-7 
•655 
10-64 
37 3 
•46 
5-37 
18-7 
•845 
237 
76-0 
•65 
10-47 
36-8 
•455 
5-24 
18-3 
•84 
23-0 
733 
•645 
10-30 
36-2 
•835 
22-3 
71-2 
•64 
10-13 
35-6 
•83 
216 
69-0 
•635 
9-97 
35-0 
•825 
21-0 
66-8 
•63 
9-82 
34-5 
•82 
20-4 
64-7 
•625 
967 
339 
•815 
19-8 
63 0 
•62 
9-52 
33 3 
•81 
19-3 
61-4 
•615 
9-38 
32-8 
These tabulations are now to be treated in exactly the same way as 
the former tabulations were. A particular yj 2 is chosen as the p 2 of the 
ray whose course is to be traced point by point. This value of p 2 is 
subtracted from all the higher values of rj 2 , and for every value of r the 
corresponding value of the reciprocal of ry/^—p 2 ) is calculated. The 
values of p 2 were chosen so that the summations could be made in groups 
of seven according to Weddle’s Rule, and in this way each integral was 
evaluated ; all except the last interval, in which infinite values had to be 
considered. 
